For example, you (China) see yourself in a world with threatening political systems all around you. But you have an advantage: you have a much greater population of peasant workers who can out-compete the rest of the world. But you know you need to maximize that or be transcended by your closest competitor (India) who is populous, too. So you compel your population to produce fewer girls because males form the predominant industrial work-force. A kind of state-genocidal imperative becomes patriotic, a moral choice made for the long-term good at the expense of half its children.
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